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IVssCreateExpressWriterMetadata::SetBackupSchema method

Used by an express writer to indicate in its Writer Metadata Document the types of backup operations it can participate in.

Syntax

C++


HRESULT SetBackupSchema(
  [in]  DWORD dsSchemaMask
);

Parameters

dsSchemaMask [in]: A bitmask of VSS_BACKUP_SCHEMA enumeration values that specify the types of backup operations this writer supports.

Return value

The following are the valid return codes for this method.

Value	Meaning
S_OK	Successfully set the failure message.
E_INVALIDARG	The backup schema argument is not valid.
E_OUTOFMEMORY	The caller is out of memory or other system resources.
VSS_E_INVALID_XML_DOCUMENT	The XML document is not valid. Check the event log for details. For more information, see Event and Error Handling Under VSS.

Remarks

If no schema is explicitly set by SetBackupSchema, the express writer will be assigned the default value of VSS_BS_UNDEFINED. VSS_BS_UNDEFINED means that the writer supports only simple full backup and restoration of entire files (as defined by VSS_BT_FULL), there is no support for incremental or differential backups, and partial files are not supported. Only the VSS_BS_UNDEFINED, VSS_BS_COPY and VSS_BS_INDEPENDENT_SYSTEM_STATE backup schema types are supported by express writers.

Requesters call IVssExamineWriterMetadata::GetBackupSchema to retrieve a writer's backup schemas as set by SetBackupSchema.

Requirements

Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]
Header	VsWriter.h (include Vss.h or VsWriter.h)
Library	VssApi.lib

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